There is a similar discussion in a different thread, somehow this driver never developed an “official thread” yet…
relic38 mentioned the resistor near the negative lead to be the sense resistor. So this should be the “25LO”, mine came without the yellow goo of your’s. 25LO seems to be 0.025 Ohm and somewhere I read that sense resistors tend to be very small.
relic38 also said you would increase that resistor value to get a lower current. My guess is this whole thing works linear, as Kokopelli wrote here
The following is my presumtion (the math is correct, but the conclusion might not…) so please take this with a grain of salt:
Lowering the current needs higher resistor, thus changing the existing one completely.
Increasing the current needs a smaller resistor, adding one in parallel will do that. So:
0.025 Ohm = 3 A
add 0.330 Ohm in parallel (=0.02324 Ohm) -> 3.22 A
add 0.200 Ohm in parallel (=0.02222 Ohm) -> 3.38 A
add 0.150 Ohm in parallel (=0.02143 Ohm) -> 3.50 A
add 0.100 Ohm in parallel (=0.02000 Ohm) -> 3.75 A
and so on…
I’d like to verify this, but I don’t have any SMD resistors at all, let alone these small values, so I will need to order them.
Furthermore I’m a bit hesitant to increase the current significantly, because PilotPTK wrote (for a different driver)
Luckily HKJ promised to include this driver into his large driver test.
Greetings